John p



' (No Model.)

' J. P. LAHM.

PUMP.

No. 484,898. Patented Oct. 25, 1892.

umm: l Rg. Z2A iHH-@MII y A EEMnmmmuw ,n.lllil lill r f ummm www. www mmm UNITED STATES PATENT OFFICE.

JOHN P. LAHM, OF REESEVILLE, VISCONSIN.

PUMP.

SPECIFICATION forming part of Letters Patent No. 484,898, dated October 25, 1892.

Application filed April 11, 1892. Serial No. 428,679. (No model.)

To all whom t may concern.-

' Be it known that I, JOHN P. LAHM, a citizen of the United States, residing at Reeseville, in the county of Dodge and State of Wisconsin, have invented a new and useful Pump, of which the following is a specication.

This invention relates to pumps; and it has for its object to provide a simple and inexpensive pump which is designed for forcing or lifting water to any reasonable height, while at the same time providing a pump dispensing with packing and its attendant disadvantages and having its valves so arranged as to provide means for eectively protecting the same and preventing them from becoming unseated and defective.

With these and many other objects in View, which will readily appear as the nature of the invention is better understood, the same consists in the novel construction, combination, and arrangement of parts hereinafter more fully described, illustrated, and claimed.

In the accompanying drawings, Figure lis a side elevation of a pump constructed in accordance with this invention. Fig. 2 is avertical longitudinal sectional View of the same. Fig. 3 is an enlarged elevation of the lower cap and its projecting tube.

Referring to the accompanying drawings, A represents the main barrel or cylinder, having the double interior bores d and a', respectively, the upper bore a being of a less diameter than that of the lower bore, for the purposes to be presently described, and said bores form at their central intersection the annular shoulder a3 within the cylinder. The said cylinder A is provided with upper and lower eXt-eriorly-threaded ends which receive the upper and lower threaded caps C, to which are secured the discharge-pipe D and the lower suction-pipe E, respectively, to lead the water into and out of the cylinder.

Removably fitted in the lower cap C is the upwardly-extending valve-supporting tube F, having an upper exteriorly-threaded end within the lower bore of the cylinder, which receives the eXteriorly and interiorly threaded bushing G, forming the valve-seat for the check-valve H, workin g within the valve-cage I, removably secured to said exteriorly and interiorly threaded bushing or valveseat.

By employing the valve-supporting tube F the check-valve is held up from the bottom of the cylinder, so that it can never lose its priming by having sand and other foreign matter working in over the seat and preventing the valve from evenly reseating itself, and also provides for always holding a certain depth of water in the lower bore of the cylinder.

Workingover the valve-supporting tube and within the entire cylinder A is the elongated vhollow plunger J, the body of which loosely fits the upper bore a, while the lower end of the same terminates in a shouldered packingiiange J', closely tting the lower larger bore a. The said hollow plunger is provided with the upwardly-extended threaded neck K, formingthe valve-seat for the valve L, working within the valve-cage M, engaging said threaded neck and valve-seat. The plunger-rod N is connected with said valvecage and suitable operating mechanism for reciprocating the hollow plunger within the cylinder to draw the water through the lower check-valve and lift the same up through the Kupper discharge-pipe D. It will be readily seen that by having the body of the plunger working loosely in the upper bore of the cylinder and the packing flange thereof snugly in the larger lower bore packing is dispensed with. The water that runs vover the top of the plunger and finds its way around the loosely-fitting portion of the plunger into the lower portion of the cylinder above the shouldered packing-flange provides a water-packing which steadies the plunger in its movement within the cylinder and serves all the purposes of ordinary packing.

It is now thought that the construction and many advantages of the herein described pump are apparent without further description.

Having thus described my invention, what I claim, and desire to secure by Letters Patent, is

In apump, the combination, with the doublebored cylinder, the hollow valved plunger moving therein, and the top and bottom caps removably secured to each end of the cylinder, of a valve-supporting tube removably secured at its lower end in the bottom cap and IOO provided with a threaded upper end project- 1ng wit-hin the cylinder, an exteriorly and i11- teriorly threaded valve-seat bushing or collar havingtheinnerthreadsthereof removably'engaging the upper threaded endsof thesaidtube and adapted to form a valve-seagan interiorlythreaded valve-cage removably engaging the exterior threads of said bushing or collar, and the disk valve inclosed by said valvecage and seated upon said bushing or collar,` sub- 1o stantially as s'et forth.

In testimony that I claim the foregoing as my own I have hereto affixed my signature in the presence of two witnesses.

JOHN P. LAHM.v

Witnesses: y y f S. WOODWARD, HENRY MILLER. 

